A treatment of a possibly powdered, sintered, or deposited lattice (e.g., nickel) for heat generating applications and a way to control low energy nuclear reactions ("LENR") hosted in the lattice by controlling hydride formation. The method of control and treatment involves the use of the reaction lattice, enclosed by an inert cover gas such as argon that carries hydrogen as the reactive gas in a non-flammable mixture. Hydrogen ions in the lattice are transmuted to neutrons as discussed in U.S. Patent Application Publication No. 2007/0206715 (Godes_2007)). Hydrogen moving through the lattice interacts with the newly formed neutrons generating an exothermic reaction.